TWI518378B - Light diffusing flakes and the use of this backlight - Google Patents
Light diffusing flakes and the use of this backlight Download PDFInfo
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- TWI518378B TWI518378B TW099144542A TW99144542A TWI518378B TW I518378 B TWI518378 B TW I518378B TW 099144542 A TW099144542 A TW 099144542A TW 99144542 A TW99144542 A TW 99144542A TW I518378 B TWI518378 B TW I518378B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
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- Optical Elements Other Than Lenses (AREA)
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Description
本發明係有關例如使用於液晶顯示裝置之背光的光擴散性薄片。特別是有關作可發揮作為光擴散性薄片所要求之正面亮度與擴散性之光擴散性薄片及使用此之背光。The present invention relates to a light diffusing sheet for use in, for example, a backlight of a liquid crystal display device. In particular, it relates to a light-diffusing sheet which can exhibit the front luminance and diffusibility required for a light-diffusing sheet, and a backlight using the same.
近年來，彩色液晶顯示裝置則在筆記型電腦，桌上型電腦，行動電話，PDA，導航裝置，PND，遊戲機，攜帶音樂播放器等各種領域所使用，該彩色液晶顯示裝置係具備液晶單元與背光。作為該背光的構造，知道有將光源藉由擴散板而設置於液晶單元之正下方的正下方型之構造，或者將光源設置於導光板的側面之側光式之構造等。In recent years, color liquid crystal display devices have been used in various fields such as notebook computers, desktop computers, mobile phones, PDAs, navigation devices, PNDs, game machines, and portable music players, and the color liquid crystal display devices have liquid crystal cells. With backlight. As the structure of the backlight, a structure in which a light source is disposed directly under the liquid crystal cell by a diffusion plate, or a structure in which a light source is provided on a side surface of a side surface of the light guide plate or the like is known.
對於如此之背光係為了使來自光源的光作為均一，於導光板或擴散板之光出射面上，層積光擴散性薄片，其他為了提昇正面亮度而層積棱鏡薄片等之光學構件(專利文獻1)。In order to make the light from the light source uniform, a light diffusing sheet is laminated on the light emitting surface of the light guide plate or the diffusing plate, and other optical members such as a prism sheet are laminated to increase the front luminance (Patent Document) 1).
[專利文獻1]日本特開平9-127314號公報(申請專利範圍第1項，段落號碼0034)。[Patent Document 1] Japanese Laid-Open Patent Publication No. Hei 9-127314 (Patent Application No. 1, Section No. 0034).
近年來，在行動電話，PDA等之範圍中，例如成為可視聽行動播放等，可更辨識更高精細影像的環境下。為了作為可辨識如此高精細的影像，具備於液晶顯示裝置之液晶單元之液晶像素係成為有逐漸變小的傾向，而當使用該液晶像素時，比較於以往，來自光源的光的透過率則急遽下降，成為對於正面亮度貧乏的構成。In recent years, in the range of mobile phones, PDAs, and the like, for example, it is possible to recognize a higher-definition video in an environment where a video can be played back. In order to recognize such a high-definition image, the liquid crystal pixel system of the liquid crystal cell provided in the liquid crystal display device tends to be gradually smaller. When the liquid crystal pixel is used, the transmittance of light from the light source is higher than in the related art. The rapid decline has become a component of poor frontal brightness.
為了改善有關之正面亮度的下降，而要求背光的高亮度化，對於有關之要求而言，近年來作為光源而使用高亮度LED，將如此之高亮度LED作為光源而加以設計的背光係光源附近的部位與其他的部位，對於亮度容易產生大偏差，在該背光的光出射面之亮度分布則比較於以往，更容易成為不均一，隨之，直接使用自以往所使用之光擴散性薄片中，未能充分擴散來自高亮度LED的光，而亮度分布成為不均一。In order to improve the brightness of the front side, it is required to increase the brightness of the backlight. In order to meet the requirements, in recent years, high-brightness LEDs have been used as light sources, and backlight sources such as high-brightness LEDs have been designed as light sources. The portion and the other portions are likely to have a large variation in brightness, and the luminance distribution on the light exit surface of the backlight is more likely to be uneven than in the related art, and is directly used in the light diffusing sheet used in the past. The light from the high-brightness LED is not sufficiently diffused, and the luminance distribution becomes uneven.
另一方面，為了補足擴散性的下降，而單純增加在光擴散性薄片的擴散劑之含有量等之設計時，雖提昇擴散性，但接下來正面亮度則變為貧乏，也就是在要求如近年之高精彩的影像之辨識性的環境下，作為擴散性與正面亮度並存之光擴散性薄片係可說並未充分加以設計之構成。On the other hand, in order to compensate for the decrease in diffusibility, and simply increase the content of the diffusing agent in the light-diffusing sheet, etc., the diffusibility is improved, but the front luminance becomes poor, that is, in the case of demand. In the environment where the high-definition images have been recognized in recent years, the light-diffusing sheet which is a combination of diffusibility and frontal brightness can be said to have not been sufficiently designed.
因此在本發明之的一側面中，提供維持正面亮度之同時，發揮可消解因光源引起之亮度分布不均一之高擴散性之光擴散性薄片及使用此之背光。Therefore, in one aspect of the present invention, it is possible to provide a light-diffusing sheet which can reduce the unevenness in luminance distribution due to a light source while maintaining the front luminance, and a backlight using the same.
本發明係有關上述之間題點進行銳意研究的結果，經由將擴散層的表面形狀作為特定之構成之時，發現維持正面亮度之同時，發揮高擴散性情況，完成本發明。The present invention is a result of intensive research on the above-mentioned problems. When the surface shape of the diffusion layer is specifically configured, it is found that the front luminance is maintained and the high diffusibility is exhibited, and the present invention has been completed.
即，本發明之光擴散性薄片係具備擴散層之構成，前述擴散層係具有滿足下記條件1及2，或下記條件3及4之至少一項的表面形狀為特徵。In other words, the light diffusing sheet of the present invention has a configuration in which a diffusion layer has a surface shape satisfying the following conditions 1 and 2 or at least one of the following conditions 3 and 4.
條件1：將二維表面形狀測定之粗度曲線的偏斜度(JIS B0601：2001)作為Rsk時，Rsk則成為負的條件。Condition 1: When the skewness of the thickness curve of the two-dimensional surface shape measurement (JIS B0601: 2001) is taken as Rsk, Rsk becomes a negative condition.
條件2：將二維表面形狀測定之粗度曲線要素的平均高度(JIS B0601：2001)作為Rc，Rc則成為6.0μm以上的條件。Condition 2: The average height (JIS B0601: 2001) of the roughness curve element measured by the two-dimensional surface shape is defined as Rc and Rc is 6.0 μm or more.
條件3：將二維表面形狀測定之峰值計數(JIS B0601：2001)作為Pc時，Pc則成為150以上的條件。Condition 3: When the peak count (JIS B0601: 2001) of the two-dimensional surface shape measurement is taken as Pc, Pc is a condition of 150 or more.
條件4：將二維表面形狀測定之十點平均粗度(JIS B0601：2001)作為Rzjis時，Rzjis則成為12.0μm以上的條件。Condition 4: When the ten-point average roughness (JIS B0601: 2001) of the two-dimensional surface shape measurement is referred to as Rzjis, Rzjis is a condition of 12.0 μm or more.
在本發明中，擴散層係只滿足條件1及2亦可，而只滿足條件3及4亦可，更且滿足條件1~4之所有亦可。In the present invention, the diffusion layer may satisfy only the conditions 1 and 2, but may satisfy only the conditions 3 and 4, and may satisfy all of the conditions 1 to 4.
本發明之光擴散性薄片係可使用於組裝有光度為1000mcd以上的高亮度LED光源之背光，使用於此用途之情況，與使用以往構成之光擴散性薄片之情況作比較，可作為對於作為背光裝置之正面亮度及光擴散性之平衡優越之構成。The light-diffusing sheet of the present invention can be used as a backlight for assembling a high-intensity LED light source having a luminance of 1000 mcd or more, and can be used as a pair when compared with the case of using a conventional light diffusing sheet. The backlight unit has a superior balance of front brightness and light diffusibility.
另外，本發明之背光係在至少具備光源，和鄰接配置於前述光源，為了進行導光或擴散的光學板，和配置於前述光學板之光出射側的光擴散性薄片之構成中，前述光擴散性薄片則為本發明之光擴散性薄片為特徵。作為光源係例如可使用光度為1000mcd以上的高亮度LED光源等之LED光源。Further, the backlight of the present invention includes at least a light source, and an optical plate disposed adjacent to the light source for guiding or diffusing light, and a light diffusing sheet disposed on a light emitting side of the optical plate. The diffusible sheet is characterized by the light diffusing sheet of the present invention. As the light source, for example, an LED light source such as a high-intensity LED light source having a luminosity of 1000 mcd or more can be used.
如根據本發明，由將擴散層之表面形狀作為特定之構成，可提供維持作為在以往達成困難之光擴散性薄片所要求之正面亮度同時，發揮可消解因光源引起之亮度分布不均一之高擴散性之光擴散性薄片。According to the present invention, by setting the surface shape of the diffusion layer as a specific structure, it is possible to provide a front luminance required for the light-diffusing sheet which has been difficult to achieve in the past, and to exhibit a high level of unevenness in luminance distribution due to the light source. Diffuse light diffusing sheet.
特別是在近年，亦要求液晶顯示裝置之薄型化的要求，當使以往的光擴散性薄片薄型化時，正面亮度與擴散性的平衡則成為更加產生惡化之傾向，但如根據本發明之光擴散性薄片，即使做成薄型化，有關的正面亮度與擴散性之並存有顯著的發揮。In particular, in recent years, there has been a demand for a thinner liquid crystal display device. When the conventional light diffusing sheet is made thinner, the balance between front luminance and diffusibility tends to be more deteriorated. However, light according to the present invention tends to be deteriorated. Even if the diffusing sheet is made thinner, the front surface brightness and diffusibility are significantly exhibited.
以下，對於本發明之光擴散性薄片的實施形態加以說明。Hereinafter, an embodiment of the light diffusing sheet of the present invention will be described.
本發明之光擴散性薄片係具備擴散層，其擴散層係表面調整為特定形狀，具體而言，係呈滿足條件1及條件2，以及條件3及4之一方或雙方地調整擴散層之表面形狀。The light diffusing sheet of the present invention comprises a diffusion layer whose surface of the diffusion layer is adjusted to a specific shape, specifically, the surface of the diffusion layer is adjusted to satisfy one of the conditions 1 and 2, and one or both of the conditions 3 and 4. shape.
條件1係將二維表面形狀測定之粗度曲線的偏斜度(JIS B0601：2001)作為Rsk時，Rsk則成為負的條件。條件2係將二維表面形狀測定之粗度曲線要素的平均高度(JIS B0601：2001)作為Rc，Rc則成為6.0μm以上的條件。條件3係將二維表面形狀測定之峰值計數(JIS B0601：2001)作為Pc時，Pc則成為150以上的條件。條件4係將二維表面形狀測定之十點平均粗度(JIS B0601：2001)作為Rzjis時，Rzjis則成為12.0μm以上的條件。In the condition 1 , when the skewness of the thickness curve of the two-dimensional surface shape measurement (JIS B0601: 2001) is taken as Rsk, Rsk becomes a negative condition. In the condition 2, the average height (JIS B0601: 2001) of the roughness curve element measured by the two-dimensional surface shape is defined as Rc, and Rc is 6.0 μm or more. In the condition 3, when the peak count (JIS B0601: 2001) of the two-dimensional surface shape measurement is taken as Pc, Pc is a condition of 150 or more. In the condition 4, when the ten-point average roughness (JIS B0601: 2001) for measuring the two-dimensional surface shape is Rzjis, Rzjis is a condition of 12.0 μm or more.
然而，本發明之光擴散性薄片係具備擴散層之構成，但作為該光擴散性薄片之構成，係由擴散層單層所成之構成，或該擴散層層積於支持體上所成之構成亦可。However, the light diffusing sheet of the present invention has a structure of a diffusion layer, but the light diffusing sheet is composed of a single layer of a diffusion layer or a layer of the diffusion layer laminated on a support. It can also be constructed.
作為一例之擴散層係具有滿足前述條件1及條件2之表面形狀，而未滿足條件1及條件2之一方的情況，無法得到所期望之表面形狀，其結果，因擴散性成為貧乏之故而並不理想。The diffusion layer as an example has a surface shape satisfying the conditions 1 and 2, and does not satisfy one of the conditions 1 and 2, and the desired surface shape cannot be obtained. As a result, the diffusibility is poor. not ideal.
作為其他例之擴散層係具有滿足前述條件3及條件4之表面形狀。未滿足條件3及條件4之一方的情況，無法得到所期望的表面形狀，其結果，成為對擴散性貧乏之構成之故，並不理想，更且作為其他例之擴散層係具有滿足前述條件1~4所有的表面形狀。The diffusion layer of another example has a surface shape satisfying the above conditions 3 and 4. When one of the conditions 3 and 4 is not satisfied, the desired surface shape cannot be obtained, and as a result, the diffusibility is poor, which is not preferable, and the diffusion layer as another example satisfies the above conditions. 1~4 all surface shapes.
本發明之擴散層則呈滿足條件1及條件2，以及條件3及4之一方或雙方地加以調整，也就是經由具備特定之二維表面形狀的數值範圍之時，成為凹凸變化急劇之表面形狀，當經由有關的表面形狀時，入射至光擴散性薄片的光則脫出擴散層表面而出射時，使該出射光，可確保經由該擴散層之細微之凸部形狀折射至正面方向同時，亦可折射至各種方向，由此，例如使用如高亮度LED光源之光度高之光源(例如光度1000~2000mcd之構成)，亦可作為確保最佳的正面亮度同時，發揮可消解因光源引起之亮度分布不均一之充分之光擴散性之構成。The diffusion layer of the present invention is adjusted to satisfy one of the conditions 1 and 2, and one or both of the conditions 3 and 4, that is, when the numerical range having a specific two-dimensional surface shape is obtained, the surface shape of the unevenness is sharply changed. When the light incident on the light-diffusing sheet passes through the surface of the diffusion layer and exits through the relevant surface shape, the emitted light can be refracted to the front direction through the shape of the convex portion of the diffusion layer. It can be refracted in various directions, for example, by using a light source with a high luminosity such as a high-intensity LED light source (for example, a configuration of a luminosity of 1000 to 2000 mcd), it can also be used as a light source to ensure the optimum front luminance while eliminating the brightness caused by the light source. The distribution of light diffusivity that is not uniform.
然而，將對於本發明之光擴散性薄片的光出射面垂直而切斷時之剖面形狀之概略圖，示於圖1。圖1所示之光擴散性薄片1係如後述地，於支持體3上形成有擴散層2之構成，對於擴散層2中係添加有擴散劑4。However, a schematic view of a cross-sectional shape when the light-emitting surface of the light-diffusing sheet of the present invention is cut perpendicularly is shown in Fig. 1. The light diffusing sheet 1 shown in FIG. 1 has a structure in which a diffusion layer 2 is formed on a support 3 as will be described later, and a diffusing agent 4 is added to the diffusion layer 2.
在本發明之擴散層中，條件1之Rsk係從發揮正面亮度的同時，將擴散性作為更佳的觀點，作為-0.2以下為更佳。另外，從防止正面亮度下降之觀點，作為-0.6以上為佳，條件2之Rc，係從防止擴散層變過厚的觀點，作為10μm以下更佳。In the diffusion layer of the present invention, the Rsk of Condition 1 is more preferable from the viewpoint of exhibiting front luminance and diffusibility as -0.2 or less. In addition, from the viewpoint of preventing the decrease in the front luminance, it is preferably -0.6 or more, and the Rc of the condition 2 is more preferably 10 μm or less from the viewpoint of preventing the diffusion layer from becoming too thick.
條件3之Pc係從發揮正面亮度之同時，將擴散性作為更佳的觀點，作為160以上更佳，另外，從防止正面亮度下降之觀點，作為300以下為佳。條件4之Rzjis係從防止擴散層變過厚的觀點，特別為20μm以下為佳。The Pc of the condition 3 is preferably 160 or more from the viewpoint of exhibiting the front luminance, and the diffusibility is more preferable, and it is preferably 300 or less from the viewpoint of preventing the decrease in the front luminance. The Rzjis of the condition 4 is preferably 20 μm or less from the viewpoint of preventing the diffusion layer from becoming too thick.
本發明之擴散層係可使用例如，黏合劑樹脂，經由2P(Photo-Polymer)法，2T(Thermal-Transformation)法或壓印加工法等之轉印賦形技術而形成。或者，不使用轉印賦形技術而由塗佈‧乾燥由黏合劑樹脂與擴散劑等所成之塗佈液者而形成亦可。如為經由轉印賦形技術之情況，使用具備與本發明之所期望的表面凹凸形狀相補性之凹凸形狀的模具，可轉印賦形本發明之凹凸形狀之故，未使用有關凹凸形狀形成之擴散劑等之粒子而可只由黏合劑樹脂而構成。另一方面，對於未使用轉印賦形技術而經由黏合劑樹脂及擴散劑等所成之塗佈液而形成之情況，經由將擴散劑之平均粒子口徑，粒子口徑分布之變動係數，在擴散層之黏合劑樹脂與擴散劑的比例及擴散層的厚度等設定成後述之適當範圍之時，可實現本發明之所期望之表面凹凸形狀。The diffusion layer of the present invention can be formed by, for example, a binder resin by a transfer forming technique such as a 2P (Photo-Polymer) method, a 2T (Thermal-Transformation) method, or an imprint method. Alternatively, it may be formed by coating or drying a coating liquid made of a binder resin, a diffusing agent, or the like without using a transfer forming technique. In the case of a transfer forming technique, a concave-convex shape having the concave-convex shape complementary to the desired surface unevenness shape of the present invention can be used to transfer the concave-convex shape of the present invention, and the uneven shape is not used. The particles such as the diffusing agent may be composed only of the binder resin. On the other hand, in the case where a coating liquid formed by a binder resin or a diffusing agent is not formed by using a transfer forming technique, the coefficient of variation of the particle diameter distribution of the diffusing agent is diffused by the average particle diameter of the diffusing agent. When the ratio of the binder resin to the diffusing agent of the layer, the thickness of the diffusion layer, and the like are set to an appropriate range to be described later, the desired surface unevenness shape of the present invention can be achieved.
作為含於本發明之擴散層之黏合劑樹脂係可使用對於光學透明性優越的樹脂，例如可使用聚酯系樹脂，丙烯酸系樹脂，丙烯氨基甲酸乙酯系樹脂，聚酯丙烯酸酯系樹脂，聚氨基甲酸乙酯丙烯酸酯系樹脂，環氧丙烯酸酯系樹脂，氨基甲酸乙酯系樹脂，環氧系樹脂，聚碳酸酯系樹脂，纖維素系樹脂，縮醛系樹脂，聚乙烯系樹脂，聚苯乙烯系樹脂，聚醯胺系樹脂，聚醯亞胺系樹脂，密胺系樹脂，酚系樹脂，矽系樹脂等之熱可塑性樹脂，熱硬化性樹脂，離子化放射線硬化性樹脂等，此等之中，最佳使用對於耐光性或光學特性優越之丙烯酸系樹脂。As the binder resin to be contained in the diffusion layer of the present invention, a resin excellent in optical transparency can be used, and for example, a polyester resin, an acrylic resin, an acryl urethane resin, or a polyester acrylate resin can be used. Polyurethane acrylate resin, epoxy acrylate resin, urethane resin, epoxy resin, polycarbonate resin, cellulose resin, acetal resin, polyethylene resin, a thermoplastic resin such as a polystyrene-based resin, a polyamine-based resin, a polyamidene-based resin, a melamine-based resin, a phenol-based resin, a fluorene-based resin, a thermosetting resin, or an ionizing radiation-curable resin. Among these, an acrylic resin excellent in light resistance or optical characteristics is preferably used.
接著，作為擴散劑係除了二氧化矽，粘土，滑石，碳酸鈣，硫酸鈣，硫酸鋇，矽酸鋁，氧化鈦，合成沸石，氧化鋁，綠土等之無機微粒子之其他，可使用苯乙烯樹脂，氨基甲酸乙酯樹脂，苯胍胺樹脂，矽樹脂，丙烯酸樹脂等所成之有機微粒子，此等之中，從提昇亮度性能的觀點，使用有機微粒子為佳，特別是使用丙烯酸樹脂所成之有機微粒子為佳，該擴散劑係不只1種，組合複數種而使用亦可。Next, as a diffusing agent, in addition to inorganic fine particles such as cerium oxide, clay, talc, calcium carbonate, calcium sulfate, barium sulfate, aluminum silicate, titanium oxide, synthetic zeolite, alumina, smectite, etc., styrene may be used. Organic fine particles such as resin, urethane resin, benzoguanamine resin, oxime resin, acrylic resin, etc. Among them, organic fine particles are preferably used from the viewpoint of improving brightness performance, particularly using acrylic resin. The organic fine particles are preferred, and the diffusing agent is not limited to one type, and a plurality of types may be used in combination.
擴散劑的形狀，並無特別加以限定，但對於光散性優越之球狀粒子為佳，另外，作為該擴散劑之平均粒子口徑，從容易得到本發明之擴散層的所期望之表面形狀，將光擴散性與正面亮度的性能平衡作為最佳之觀點，作為1~40μm為佳，更且從防止因光擴散層的光漏引起之閃爍之觀點或低成本的觀點，將該擴散劑的平均粒子口徑作為1~20μm更佳。The shape of the diffusing agent is not particularly limited, but is preferably spherical particles having excellent light diffusibility, and the desired surface shape of the diffusing layer of the present invention is easily obtained as the average particle diameter of the diffusing agent. From the viewpoint of optimizing the balance between the light diffusibility and the front luminance, it is preferably 1 to 40 μm, and further, from the viewpoint of preventing flicker due to light leakage of the light diffusion layer or low cost, the diffusing agent is used. The average particle diameter is preferably 1 to 20 μm.
擴散劑之粒子口徑分布的變動係數係從容易得到本發明之擴散層的所期望之表面形狀之觀點，作為5%～55%程度為佳，而作為10~30%更佳。The coefficient of variation of the particle diameter distribution of the diffusing agent is preferably from 5% to 55%, and more preferably from 10 to 30%, from the viewpoint of easily obtaining a desired surface shape of the diffusion layer of the present invention.
對於在本發明之擴散層中的黏合劑樹脂之擴散劑的含有比例係並不能一概說是根據所使用之擴散劑之平均粒子口徑或光擴散層之厚度，但從容易得到本發明之擴散層的所期望之表面形狀，將光擴散性與正面亮度的性能平衡作為最佳之觀點，對於黏合劑樹脂100重量份而言含有100~250重量份擴散劑為佳，更且，從防止因樹脂與微粒子的折射率差引起之透明性的下降之觀點或作為低成本的觀點，作為100~200重量份更為佳。The content ratio of the diffusing agent to the binder resin in the diffusion layer of the present invention is not limited to the average particle diameter of the diffusing agent used or the thickness of the light diffusing layer, but the diffusion layer of the present invention is easily obtained. The desired surface shape is a balance between the light diffusing property and the front luminance property. It is preferable to contain 100 to 250 parts by weight of the diffusing agent for 100 parts by weight of the binder resin, and more preferably, from the resin. The viewpoint of the decrease in the transparency due to the difference in the refractive index of the fine particles or the viewpoint of low cost is more preferably 100 to 200 parts by weight.
對於該擴散層中，除了上述之高分子樹脂或擴散劑之其他，亦可添加光聚合開始劑，光聚合促進劑，調平劑‧消泡劑等之界面活性劑，氧化防止劑，紫外線吸收劑等之添加劑。In the diffusion layer, a photopolymerization initiator, a photopolymerization accelerator, a leveling agent, a surfactant such as a defoaming agent, an oxidation inhibitor, and ultraviolet absorption may be added in addition to the above-mentioned polymer resin or a diffusing agent. Additives such as agents.
擴散層的厚度係對於以擴散層單層構成本發明之光擴散性薄片的情況，作為10~500μm為佳，作為10~250μm更佳，而經由將厚度作為10μm以上之時，將塗膜強度作為充分，另外，可將操作性作為良好，另一方面，經由將厚度作為500μm以下之時，可將擴散層的透明性作為良好，另外，對於於支持體上形成擴散層之情況，從發揮光擴散性能之同時，容易得到本發明之擴散層的表面形狀之觀點，作為5~60μm為佳，而作為7~30μm更佳，然而，擴散層的厚度係指從擴散層的凹凸面的凸部前端至與凹凸面相反面之表面的厚度。The thickness of the diffusion layer is preferably 10 to 500 μm, more preferably 10 to 250 μm, and 10 to 250 μm, and the film strength is 10 μm or more. In addition, the operability is good, and when the thickness is 500 μm or less, the transparency of the diffusion layer can be improved, and the diffusion layer can be formed on the support. The light diffusing property is easy to obtain the surface shape of the diffusion layer of the present invention, and is preferably 5 to 60 μm, more preferably 7 to 30 μm. However, the thickness of the diffusion layer means convexity from the uneven surface of the diffusion layer. The thickness of the front end to the surface opposite to the uneven surface.
接著，對於本發明之光擴散性薄片具有支持體的情況，該支持體係可未特別加以限制而使用，例如可使用混合聚酯系樹脂，丙烯酸系樹脂，丙烯氨基甲酸乙酯系樹脂，聚酯丙烯酸酯系樹脂，聚氨基甲酸乙酯丙烯酸酯系樹脂，環氧丙烯酸酯系樹脂，氨基甲酸乙酯系樹脂，環氧系樹脂，聚碳酸酯系樹脂，纖維素系樹脂，縮醛系樹脂，乙烯系樹脂，聚乙烯系樹脂，聚苯乙烯系樹脂，聚丙烯系樹脂，聚醯胺系樹脂，聚醯亞胺系樹脂，密胺系樹脂，酚系樹脂，矽系樹脂，氟素系樹脂，環狀烯烴等1種或2種以上之透明塑料薄膜，其中，作為延伸加工，特別是作為二軸延伸加工之聚對苯二甲酸二乙酯薄膜則在對於機械性強度或尺寸安定性優越的點而為理想，另外，為了提昇與光擴散層的黏接性，於表面施以電暈放電，以及適當使用設置易黏接層之構成。然而，支持體的厚度係通常10~400μm為佳。Next, in the case where the light-diffusing sheet of the present invention has a support, the support system can be used without particular limitation, and for example, a mixed polyester resin, an acrylic resin, an acryl urethane resin, or a polyester can be used. Acrylate resin, polyurethane acrylate resin, epoxy acrylate resin, urethane resin, epoxy resin, polycarbonate resin, cellulose resin, acetal resin, Vinyl resin, polyethylene resin, polystyrene resin, polypropylene resin, polyamine resin, polyamidene resin, melamine resin, phenol resin, lanthanum resin, fluororesin resin One or two or more kinds of transparent plastic films, such as a cyclic olefin, in which the polyethylene terephthalate film, which is a biaxially stretched process, is excellent in mechanical strength or dimensional stability. In order to improve the adhesion to the light-diffusing layer, a corona discharge is applied to the surface, and a configuration in which an easy-adhesion layer is provided is suitably used. However, the thickness of the support is usually 10 to 400 μm.
另外，對於與本發明之光擴散性薄片表面之凹凸面相反側的面，為了防止與其他構件之緊密，施以微墊處理，以及為了使光透過率提昇而施以反射防止處理亦可，更且，經由如以下的塗佈乾燥法之時，設置底漆層或帶電防止層或黏接層亦可。In addition, the surface on the opposite side to the uneven surface of the surface of the light-diffusing sheet of the present invention may be subjected to a micro-pad treatment in order to prevent adhesion to other members, and an anti-reflection treatment may be applied to increase the light transmittance. Further, when the coating drying method is as follows, a primer layer, a charging prevention layer or an adhesive layer may be provided.
在此，一般光擴散性薄片的總厚度係通常20~460μm程度，但擴散層如為呈滿足條件1及條件2，以及條件3及4之一方或雙方地加以調整之構成，即使擴散層的厚度為薄，作為光擴散性薄片的總厚為20~80μm程度之薄型的構成，亦發揮優越的正面亮度及擴散性，隨之，在設計自以往謀求光擴散性及正面亮度並存為困難的薄型之光擴散性薄片時，更佳適用本發明之光擴散性薄片。Here, the total thickness of the light diffusing sheet is generally about 20 to 460 μm, but the diffusion layer is configured to satisfy one of the conditions 1 and 2, and the conditions 3 and 4, even if the diffusion layer is The thickness is thin, and the thickness of the light-diffusing sheet is as thin as 20 to 80 μm. The front surface brightness and diffusibility are also excellent, and it is difficult to combine light diffusibility and front brightness. In the case of a thin light diffusing sheet, the light diffusing sheet of the present invention is more preferably used.
對於本發明之光擴散性薄片，未使用轉印賦形技術而經由塗佈等而製作之情況，將上述之黏合劑樹脂或擴散劑等之材料溶解於適當的溶媒之擴散層用塗佈液，可經由自以往公知的方法，例如，桿塗佈裝置，刮片塗佈裝置，旋塗塗佈裝置，滾塗塗佈裝置，凹版塗佈裝置，澆注式塗佈裝置，模塗佈裝置，噴墨，網版印刷等而塗佈於支持體上，再經由進行乾燥而製作，另外，由從形成擴散層於支持體上之構成，剝離去除該支持體者，亦可製作擴散層單層所成之光擴散性薄片。In the case where the light-diffusing sheet of the present invention is produced by coating or the like without using a transfer forming technique, the above-mentioned material such as a binder resin or a diffusing agent is dissolved in a suitable solvent for a diffusion layer coating liquid. By a conventionally known method, for example, a rod coating device, a blade coating device, a spin coating device, a roll coating device, a gravure coating device, a cast coating device, a die coating device, It is applied to a support by inkjet, screen printing, or the like, and is produced by drying. Further, by forming a diffusion layer on a support, the support can be peeled off and removed, and a diffusion layer can be produced. A light diffusing sheet formed.
如根據以上說明之本發明的光擴散性薄片，在近年之高精細化之液晶顯示裝置的環境，亦做成擴散性與正面亮度之並存的構成之故，適合使用在筆記型電腦，桌上型電腦，行動電話，PDA，導航裝置，PND，遊戲機，攜帶音樂播放器等各種領域。According to the light-diffusing sheet of the present invention described above, in the environment of the high-definition liquid crystal display device in recent years, the diffusing property and the front luminance are also combined, and it is suitable for use in a notebook computer and a table. Computers, mobile phones, PDAs, navigation devices, PNDs, game consoles, portable music players and other fields.
接著，對於具備本發明之光擴散性薄片之本發明的背光之實施形態加以說明。本發明之背光係至少由本發明之光擴散性薄片，和光源加以構成。在背光中之光擴散性薄片的方向雖無特別加以限制，但理想為凹凸面呈光出射面地使用，背光係採用所謂側光式，所謂正下方形之構成為佳。Next, an embodiment of the backlight of the present invention including the light diffusing sheet of the present invention will be described. The backlight of the present invention is composed of at least the light diffusing sheet of the present invention and a light source. Although the direction of the light-diffusing sheet in the backlight is not particularly limited, it is preferable that the uneven surface is used as a light-emitting surface, and the backlight is a so-called side-light type, and a so-called right-square shape is preferable.
側光式之背光裝置係由導光板，和配置於導光板之至少一端部的光源，和配置於導光板之光出射面側的光擴散性薄片加以構成，在此，光擴散性薄片係凹凸面呈光出射面地加以使用為佳，另外，於導光板與光擴散性薄片之間亦可使用稜鏡薄片，由作為如此之構成，可做成對於正面亮度，視野角之平衡優越的背光裝置。The edge-lit backlight device is composed of a light guide plate, a light source disposed on at least one end portion of the light guide plate, and a light diffusing sheet disposed on the light emitting surface side of the light guide plate. Here, the light diffusing sheet is uneven. It is preferable to use the surface as a light-emitting surface, and a ruthenium sheet may be used between the light guide plate and the light-diffusing sheet, and as such a configuration, it is possible to provide a backlight having excellent balance of front luminance and viewing angle. Device.
導光板係至少將一個側面作為光入射面，將與此略垂直交叉的一方的面做呈光出射面地加以成形之略平板狀所成之構成，主要選自聚甲基丙烯酸甲酯等高透明之樹脂的矩陣樹脂所成，因應必要，添加與矩陣樹脂折射率不同之樹脂粒子亦可，導光板的各面係並非一樣的平面而可作為複雜的表面形狀，設置點圖案等之擴散印刷亦可。The light guide plate has at least one side surface as a light incident surface, and a surface which is slightly perpendicularly intersected with the surface is formed into a flat plate shape which is formed by a light exit surface, and is mainly selected from the group consisting of polymethyl methacrylate and the like. A matrix resin of a transparent resin may be added, and if necessary, a resin particle having a refractive index different from that of the matrix resin may be added, and each surface of the light guide plate may not have the same plane, and may be a complicated surface shape, and a diffusion printing such as a dot pattern may be provided. Also.
光源係配置於導光板之至少一端部之構成，主要使用冷陰極管，LED光源等，作為光源的形狀係可舉出點狀，線狀，L字狀之構成等。在如此的光源之中，LED光源，特別是使用高亮度LED光源(光度為1000~2000mcd程度之構成)時，取得作為背光裝置之正面亮度及光擴散性的平衡則變為困難，但在如此的情況，經由與本發明之光擴散性薄片組合之時，可作為對於正面亮度及光擴散性的平衡優越之構成。The light source is disposed at least one end portion of the light guide plate, and a cold cathode tube, an LED light source, or the like is mainly used, and the shape of the light source may be a dot shape, a linear shape, or an L shape. Among such light sources, in particular, when a high-brightness LED light source (having a luminosity of 1000 to 2000 mcd) is used, it is difficult to obtain a balance between front luminance and light diffusibility of the backlight device, but in this case, In the case of being combined with the light diffusing sheet of the present invention, it can be used as a structure excellent in balance between front luminance and light diffusibility.
對於側光式背光裝置，除了前述之光擴散性薄片，導光板，光源之外，因應目的具備反射板，偏光薄膜，電磁波防護薄膜等。The edge-lit backlight device includes a reflector, a polarizing film, an electromagnetic wave shielding film, and the like in addition to the light diffusing sheet, the light guide plate, and the light source described above.
接著，正下方型之背光裝置係由光擴散性薄片，和依序配置於與光擴散性薄片的光出射面相反側的面之光擴散材料，光源加以構成，在此，光擴散性薄片係凹凸面呈光出射面地使用為佳，另外，於光擴散材料與光擴散性薄片之間亦可使用稜鏡薄片，由作為如此之構成，可做成對於正面亮度，視野角之平衡優越的背光裝置。Next, the backlight device of the direct type is composed of a light diffusing sheet and a light diffusing material which is disposed on the surface opposite to the light emitting surface of the light diffusing sheet, and a light source. Here, the light diffusing sheet is formed. It is preferable to use the uneven surface as a light-emitting surface, and a ruthenium sheet may be used between the light-diffusing material and the light-diffusing sheet. With such a configuration, it is possible to achieve a superior balance of front luminance and viewing angle. Backlight device.
光擴散材料係消除光源的圖案之構成，除了乳白色的樹脂板，於對應於光源之部分形成點圖案之透明薄膜(光覆幕)之其他，可單獨或適宜組合於透明基板上具有凹凸之光擴散層之所謂光擴散薄膜等而使用。The light diffusing material is configured to eliminate the pattern of the light source. In addition to the milky white resin sheet, the transparent film (light curtain) which forms a dot pattern corresponding to the portion of the light source may be separately or appropriately combined with the light having the unevenness on the transparent substrate. A so-called light diffusion film of a diffusion layer or the like is used.
光源係可使用與使用在前述側光式之背光裝置之構成同樣的構成，另外，對於正下方型之背光裝置，係除了前述之光擴散性薄片，光擴散材料，光源之外，對應於目的，亦可具備反射板，偏光薄膜，電磁波防護薄膜等。The light source system can be configured in the same manner as the backlight device used in the above-described sidelight type, and the backlight device of the direct type is provided in addition to the light diffusing sheet, the light diffusing material, and the light source described above. It can also be equipped with a reflector, a polarizing film, an electromagnetic wave protection film, and the like.
本發明之背光裝置係至少具備光源，和鄰接於光源加以配置，為了進行導光或擴散的光學板，和配置於光學板之光出射側的光擴散性薄片，作為光擴散性薄片而使用前述本發明之光擴散性薄片之故，可做成對於正面亮度及光擴散性之平衡優越的構成。The backlight device of the present invention includes at least a light source, and an optical plate disposed adjacent to the light source for guiding or diffusing light, and a light diffusing sheet disposed on the light emitting side of the optical plate, and the light diffusing sheet is used as the light diffusing sheet. The light diffusing sheet of the present invention can be configured to have a superior balance between front brightness and light diffusibility.
以下，經由實施例更加說明本發明，然而，「份」、「%」係只要未特別顯示，作為重量基準。Hereinafter, the present invention will be further described by way of examples, however, "parts" and "%" are based on weight unless otherwise indicated.
在混合攪拌下記配方之光擴散層用塗佈液之後，於厚度50μm之聚對苯二甲酸二乙酯薄膜(RUMIRRORT-60：日本Toray公司)所成之支持體上，乾燥厚度呈成為13μm地經由棒塗法加以塗佈‧乾燥而形成光擴散層，得到實施例1之光擴散性薄片。After the coating liquid for the light-diffusing layer of the formulation was mixed under stirring, the thickness of the polyethylene-terephthalate film (RUMIRRORT-60: Toray, Japan) having a thickness of 50 μm was 13 μm. The light-diffusing layer was formed by coating with a bar coating method and drying to obtain a light-diffusing sheet of Example 1.
‧丙烯聚醇 10份‧Propylene polyol 10 parts
(ACRYDICA-807：DIC公司)(ACRYDICA-807: DIC Corporation)
‧異氰酸酯系硬化劑 2份‧ Isocyanate hardener 2 parts
(TakenateD110N：三井化學公司)(TakenateD110N: Mitsui Chemicals)
‧聚甲基丙烯酸甲酯真球狀粒子 9份‧ polymethyl methacrylate true spherical particles 9 parts
(平均粒徑8μm，變動係數30%)(average particle size 8 μm, coefficient of variation 30%)
‧稀釋溶劑 33份‧Dilution solvent 33 parts
將實施例1之光擴散層用塗佈液變更為下記配方之光擴散層用塗佈液，乾燥之後厚度呈成為12μm地設計以外，與實施例1同樣作為而得到實施例2之光擴散性薄片。The light-diffusing property of Example 2 was obtained in the same manner as in Example 1 except that the coating liquid for a light-diffusing layer of Example 1 was changed to the coating liquid for a light-diffusing layer of the following formulation, and the thickness was 12 μm after drying. Sheet.
‧丙烯聚醇 10份‧Propylene polyol 10 parts
(ACRYDICA-807：DIC公司)(ACRYDICA-807: DIC Corporation)
‧異氰酸酯系硬化劑 2份‧ Isocyanate hardener 2 parts
(TakenateD110N：三井化學公司)(TakenateD110N: Mitsui Chemicals)
‧聚甲基丙烯酸甲酯真球狀粒子 10份‧ polymethyl methacrylate true spherical particles 10 parts
(平均粒徑8μm，變動係數20%)(average particle size 8 μm, coefficient of variation 20%)
‧稀釋溶劑 36份‧Dilution solvent 36 parts
將實施例1之光擴散層用塗佈液變更為下記配方之光擴散層用塗佈液，乾燥之後厚度呈成為18μm地設計以外，與實施例1同樣作為而得到實施例3之光擴散性薄片。The light-diffusing property of Example 3 was obtained in the same manner as in Example 1 except that the coating liquid for a light-diffusing layer of Example 1 was changed to the coating liquid for a light-diffusing layer of the following formulation, and the thickness was 18 μm after drying. Sheet.
‧丙烯聚醇 10份‧Propylene polyol 10 parts
(ACRYDICA-807：DIC公司)(ACRYDICA-807: DIC Corporation)
‧異氰酸酯系硬化劑 2份‧ Isocyanate hardener 2 parts
(TakenateD110N：三井化學公司)(TakenateD110N: Mitsui Chemicals)
‧聚甲基丙烯酸甲酯真球狀粒子 11份‧ polymethyl methacrylate true spherical particles 11 parts
(平均粒徑10μm，變動係數30%)(average particle size 10 μm, coefficient of variation 30%)
‧稀釋溶劑 28份‧Dilution solvent 28 parts
將實施例1之光擴散層用塗佈液變更為下記配方之光擴散層用塗佈液，乾燥之後厚度呈成為27μm地設計以外，與實施例1同樣作為而得到實施例4之光擴散性薄片。The light-diffusing property of Example 4 was obtained in the same manner as in Example 1 except that the coating liquid for a light-diffusing layer of Example 1 was changed to the coating liquid for a light-diffusing layer of the following formulation, and the thickness was 27 μm after drying. Sheet.
‧丙烯聚醇 16份‧Propylene alcohol 16 parts
(ACRYDICA-807：DIC公司)(ACRYDICA-807: DIC Corporation)
‧異氰酸酯系硬化劑 3份‧ Isocyanate hardener 3 parts
(TakenateD110N：三井化學公司)(TakenateD110N: Mitsui Chemicals)
‧聚甲基丙烯酸甲酯真球狀粒子 20份‧ polymethyl methacrylate true spherical particles 20 parts
(平均粒徑19.6μm，變動係數35%)(average particle size 19.6 μm, coefficient of variation 35%)
‧稀釋溶劑 43份‧Diluted solvent 43 parts
將實施例1之光擴散層用塗佈液變更為下記配方之光擴散層用塗佈液，乾燥之後厚度呈成為11μm地設計以外，與實施例1同樣作為而得到比較例1之光擴散性薄片。The light-diffusing property of Comparative Example 1 was obtained in the same manner as in Example 1 except that the coating liquid for a light-diffusing layer of Example 1 was changed to the coating liquid for a light-diffusing layer of the following formulation, and the thickness was 11 μm after drying. Sheet.
‧丙烯聚醇 10份‧Propylene polyol 10 parts
(ACRYDICA-807：DIC公司)(ACRYDICA-807: DIC Corporation)
‧異氰酸酯系硬化劑 2份‧ Isocyanate hardener 2 parts
(TakenateD110N：三井化學公司)(TakenateD110N: Mitsui Chemicals)
‧聚甲基丙烯酸甲酯真球狀粒子 6份‧ polymethyl methacrylate true spherical particles 6 parts
(平均粒徑8μm，變動係數10%)(average particle size 8 μm, coefficient of variation 10%)
‧稀釋溶劑 22份‧Diluted solvent 22 parts
將實施例1之光擴散層用塗佈液變更為下記配方之光擴散層用塗佈液，乾燥之後厚度呈成為10μm地設計以外，與實施例1同樣作為而得到比較例2之光擴散性薄片。The light diffusing property of Comparative Example 2 was obtained in the same manner as in Example 1 except that the coating liquid for a light-diffusing layer of Example 1 was changed to the coating liquid for a light-diffusing layer of the following formulation, and the thickness was 10 μm after drying. Sheet.
‧丙烯聚醇 10份‧Propylene polyol 10 parts
(ACRYDICA-807：DIC公司)(ACRYDICA-807: DIC Corporation)
‧異氰酸酯系硬化劑 2份‧ Isocyanate hardener 2 parts
(TakenateD110N：三井化學公司)(TakenateD110N: Mitsui Chemicals)
‧聚甲基丙烯酸甲酯真球狀粒子 5份‧ polymethyl methacrylate true spherical particles 5 parts
(平均粒徑10μm，變動係數10%)(average particle size 10 μm, coefficient of variation 10%)
‧稀釋溶劑 23份‧Diluted solvent 23 parts
將實施例1之光擴散層用塗佈液變更為下記配方之光擴散層用塗佈液，乾燥之後厚度呈成為20μm地設計以外，與實施例1同樣作為而得到比較例3之光擴散性薄片。The light-diffusing property of Comparative Example 3 was obtained in the same manner as in Example 1 except that the coating liquid for a light-diffusing layer of Example 1 was changed to the coating liquid for a light-diffusing layer of the following formulation, and the thickness was 20 μm after drying. Sheet.
‧丙烯聚醇 10份‧Propylene polyol 10 parts
(ACRYDICA-807：DIC公司)(ACRYDICA-807: DIC Corporation)
‧異氰酸酯系硬化劑 2份‧ Isocyanate hardener 2 parts
(TakenateD110N：三井化學公司)(TakenateD110N: Mitsui Chemicals)
‧聚甲基丙烯酸甲酯真球狀粒子 7份‧ polymethyl methacrylate true spherical particles 7 parts
(平均粒徑10μm，變動係數30%)(average particle size 10 μm, coefficient of variation 30%)
‧稀釋溶劑 23份‧Diluted solvent 23 parts
將實施例1之光擴散層用塗佈液變更為下記配方之光擴散層用塗佈液，乾燥之後厚度呈成為10μm地設計以外，與實施例1同樣作為而得到比較例4之光擴散性薄片。The light-diffusing property of Comparative Example 4 was obtained in the same manner as in Example 1 except that the coating liquid for a light-diffusing layer of Example 1 was changed to the coating liquid for a light-diffusing layer of the following formulation, and the thickness was 10 μm after drying. Sheet.
‧丙烯聚醇 10份‧Propylene polyol 10 parts
(ACRYDICA-807：DIC公司)(ACRYDICA-807: DIC Corporation)
‧異氰酸酯系硬化劑 2份‧ Isocyanate hardener 2 parts
(TakenateD110N：三井化學公司)(TakenateD110N: Mitsui Chemicals)
‧聚甲基丙烯酸甲酯真球狀粒子 7份‧ polymethyl methacrylate true spherical particles 7 parts
(平均粒徑8μm，變動係數20%)(average particle size 8 μm, coefficient of variation 20%)
‧稀釋劑 32份‧Diluent 32 parts
將實施例1之光擴散層用塗佈液變更為下記配方之光擴散層用塗佈液，乾燥之後厚度呈成為11μm地設計以外，與實施例1同樣作為而得到比較例5之光擴散性薄片。The light diffusing property of Comparative Example 5 was obtained in the same manner as in Example 1 except that the coating liquid for a light-diffusing layer of Example 1 was changed to the coating liquid for a light-diffusing layer of the following formulation, and the thickness was 11 μm after drying. Sheet.
‧丙烯聚醇 10份‧Propylene polyol 10 parts
(ACRYDICA-807：DIC公司)(ACRYDICA-807: DIC Corporation)
‧異氰酸酯系硬化劑 2份‧ Isocyanate hardener 2 parts
(TakenateD110N：三井化學公司)(TakenateD110N: Mitsui Chemicals)
‧聚甲基丙烯酸甲酯真球狀粒子 6份‧ polymethyl methacrylate true spherical particles 6 parts
(平均粒徑8μm，變動係數30%)(average particle size 8 μm, coefficient of variation 30%)
‧稀釋溶劑 23份‧Diluted solvent 23 parts
對於實施例1~4及比較例1~3的光擴散性薄片之擴散層表面，使用觸針式表面形狀測定機(SAS-2010 SAU-II：日本明伸工機公司，前端半徑5μm，材質金剛石，測定力0.8mN)，各任意測定10處在二維表面形狀測定之粗度曲線的偏斜度Rsk及在二維表面形狀測定之粗度曲線要素之平均高度Rc，得到此等之平均值。將測定結果示於表1。For the surface of the diffusion layer of the light-diffusing sheet of Examples 1 to 4 and Comparative Examples 1 to 3, a stylus type surface shape measuring machine (SAS-2010 SAU-II: Nippon Mingsei Corporation, front end radius 5 μm, material diamond) was used. , the measurement power is 0.8 mN), and the average value Rc of the roughness curve Rsk of the roughness curve measured by the two-dimensional surface shape and the average height Rc of the roughness curve element measured by the two-dimensional surface shape are arbitrarily measured, and the average value is obtained. . The measurement results are shown in Table 1.
對於實施例1~3及比較例2，4，5的光擴散性薄片之擴散層表面，使用相同測定機，各任意測定10處在二維表面形狀測定之峰值計數Pc及在二維表面形狀測定之十點平均粗度Rzjis，得到此等之平均值。將測定結果示於表2。With respect to the surfaces of the diffusion layers of the light-diffusing sheets of Examples 1 to 3 and Comparative Examples 2 and 4, 5, the same measurement machine was used, and the peak count Pc of the two-dimensional surface shape measurement and the two-dimensional surface shape were measured arbitrarily at ten places. The ten point average roughness Rzjis was determined to obtain an average of these. The measurement results are shown in Table 2.
接著，將在各例所得到之光擴散性薄片，在3.5英吋的側光式背光(內藏光度1400mcd之LED光源6燈，厚度0.6mm之導光板)，由該光擴散性薄片之支持體則呈與該背光之導光板對向地組裝，製作各例之背光。Next, the light-diffusing sheet obtained in each example was supported by the light-diffusing sheet in a 3.5-inch side-lit backlight (light source with a light source of 1400 mcd and a light source of 0.6 mm). The body is assembled opposite to the light guide plate of the backlight to produce backlights of various examples.
將各例所得到之背光進行點燈，測定如圖2所示之背光5之光出射面的中央附近之P點的正面亮度。將測定結果示於表3，4(單位係「cd/m2」)。The backlight obtained in each example was lit, and the front luminance of the P point near the center of the light exit surface of the backlight 5 as shown in FIG. 2 was measured. The measurement results are shown in Tables 3 and 4 (unit: "cd/m 2 ").
另外，對於各例所得到之背光，測定在如圖2所示之光源6附近之A~C點(均位置於鄰接之2個光源6之間上)的正面亮度，接著算出PA點間之正面亮度的變位(將A點的正面亮度，除以在P點的正面亮度時之比例)，同樣地，算出PB點間的正面亮度之變位，PC點間的正面亮度之變位，算出該3個變位之平均值(在背光全體之光的均一性)。將在A~C點及P點之正面亮度的測定結果示於表2，以及將各PA點間，PB點間，PC點間之變位及其平均值(在背光全體之光的均一性)之算出結果示於表5，6。Further, for each of the backlights obtained in each example, the front luminance of the A to C points (all positioned between the adjacent two light sources 6) in the vicinity of the light source 6 as shown in FIG. 2 was measured, and then the PA point was calculated. The displacement of the front luminance (the ratio of the front luminance of point A divided by the front luminance at point P) is similarly calculated as the displacement of the front luminance between the PB points and the displacement of the front luminance between the PC dots. The average value of the three displacements (the uniformity of the light in the entire backlight) was calculated. The measurement results of the front luminance at points A to C and P are shown in Table 2, and the displacement between the PA points, between the PB points, and between the PC points and the average value (the uniformity of light in the entire backlight) The calculation results are shown in Tables 5 and 6.
從表3及表5的結果，使用實施例1～4的光擴散性薄片之實施例1~4的背光係從在二維表面形狀測定之粗度曲線的偏斜度Rsk為負，粗度曲線要素的平均高度Rc為6.0μm以上之情況，了解到成為確保了正面亮度同時，在前述背光全體之光的均一性高，發揮高擴散性的構成。From the results of Tables 3 and 5, the backlights of Examples 1 to 4 using the light diffusing sheets of Examples 1 to 4 were negative from the skewness Rsk of the roughness curve measured in the two-dimensional surface shape, and the thickness was negative. In the case where the average height Rc of the curved element is 6.0 μm or more, it is understood that the front surface brightness is ensured, and the uniformity of light in the entire backlight is high, and the high diffusibility is exhibited.
另一方面，使用比較例1之光擴散性薄片的比較例1之背光係從該光擴散性薄片的光擴散層的偏斜度Rsk為正，粗度曲線要素的平均高度Rc為不足6.0μm之情況，比較於實施例，成為對於擴散性貧乏之構成。On the other hand, in the backlight of Comparative Example 1 using the light-diffusing sheet of Comparative Example 1, the skewness Rsk of the light-diffusing layer of the light-diffusing sheet was positive, and the average height Rc of the thickness curve element was less than 6.0 μm. In the case of the embodiment, it is a configuration that is poor in diffusibility.
另外，使用比較例2之光擴散性薄片的比較例2之背光係從該光擴散性薄片的光擴散層的偏斜度Rsk為負，粗度曲線要素的平均高度Rc為不足6.0μm之情況，比較於實施例，成為對於擴散性貧乏之構成。Further, in the backlight of Comparative Example 2 using the light-diffusing sheet of Comparative Example 2, the skewness Rsk of the light-diffusing layer of the light-diffusing sheet was negative, and the average height Rc of the thickness curve element was less than 6.0 μm. Compared with the embodiment, it becomes a composition for the lack of diffusivity.
另外，使用比較例3之光擴散性薄片的比較例3之背光係雖該光擴散性薄片的光擴散層的粗度曲線要素的平均高度Rc為6.0μm以上之構成，但從偏斜度Rsk為正之情況，比較於實施例，成為對於擴散性貧乏之構成。In the backlight of Comparative Example 3 of Comparative Example 3, the average height Rc of the thickness curve element of the light-diffusing layer of the light-diffusing sheet is 6.0 μm or more, but the skewness is Rsk. In the case of the positive case, it is a composition that is poor in diffusibility compared to the embodiment.
從表4及表6的結果，使用實施例1~3的光擴散性薄片之實施例1~3的背光係在擴散層之二維表面形狀測定之峰值計數Pc為150以上，十點平均粗度Rzjis為12.0μm以上之情況，成為確保了正面亮度同時，在前述背光全體之光的均一性高，發揮高擴散性的構成。From the results of Tables 4 and 6, the backlights of Examples 1 to 3 using the light-diffusing sheets of Examples 1 to 3 have a peak count Pc of 150 or more in the measurement of the two-dimensional surface shape of the diffusion layer, and an average thickness of ten points. When the degree of Rzjis is 12.0 μm or more, the front luminance is ensured, and the uniformity of light in the entire backlight is high, and the diffusibility is exhibited.
然而，一般使光擴散性薄片薄型化時，正面亮度與擴散性之平衡有產生惡化之傾向，但實施例1~3的背光，其光擴散性薄片與實施例4之光擴散性薄片進行比較，總厚度均不足70μm，雖為薄型之光擴散性薄片但可確認到對於正面亮度與擴散性之平衡優越之構成。此係實施例1~3之背光係認為因使用滿足本發明之條件1~4所有的條件的實施例1~3之光擴散性薄片。However, when the light-diffusing sheet is generally thinned, the balance between the front luminance and the diffusibility tends to be deteriorated. However, in the backlights of Examples 1 to 3, the light-diffusing sheet is compared with the light-diffusing sheet of Example 4. The total thickness was less than 70 μm, and although it was a thin light diffusing sheet, it was confirmed that the balance between the front luminance and the diffusibility was excellent. The backlights of Examples 1 to 3 are considered to be light-diffusing sheets of Examples 1 to 3 which satisfy all the conditions of the conditions 1 to 4 of the present invention.
另一方面，使用比較例2之光擴散性薄片的比較例2之背光係從該光擴散性薄片的光擴散層之峰值計數Pc不足150，且十點平均粗度Rzjis不足12.0μm之情況，比較於實施例，成為對於擴散性貧乏之構成。On the other hand, in the backlight of Comparative Example 2 using the light-diffusing sheet of Comparative Example 2, the peak count Pc of the light-diffusing layer of the light-diffusing sheet was less than 150, and the ten-point average roughness Rzjis was less than 12.0 μm. Compared with the embodiment, it becomes a constitution for the lack of diffusibility.
另外，使用比較例4之光擴散性薄片的比較例4之背光係從該光擴散性薄片的光擴散層之峰值計數Pc雖為150以上，但十點平均粗度Rzjis不足12.0μm之情況，比較於實施例，成為對於擴散性貧乏之構成。In the case of the backlight of Comparative Example 4 of Comparative Example 4, the peak count Pc of the light-diffusing layer of the light-diffusing sheet is 150 or more, but the ten-point average roughness Rzjis is less than 12.0 μm. Compared with the embodiment, it becomes a constitution for the lack of diffusibility.
另外，使用比較例5之光擴散性薄片的比較例5之背光係從該光擴散性薄片的光擴散層之十點平均粗度Rzjis雖為12.0μm以上，但峰值計數Pc不足150之情況，比較於實施例，成為對於擴散性貧乏之構成。In the case of the backlight of Comparative Example 5 of Comparative Example 5, the ten-point average roughness Rzjis of the light-diffusing layer of the light-diffusing sheet is 12.0 μm or more, but the peak count Pc is less than 150. Compared with the embodiment, it becomes a constitution for the lack of diffusibility.
1．．．光擴散性薄片1. . . Light diffusing sheet
2．．．擴散層2. . . Diffusion layer
3．．．支持體3. . . Support
4．．．擴散劑4. . . Diffusion agent
5．．．背光5. . . Backlight
6．．．光源6. . . light source
圖1係顯示本發明之光擴散性薄片之一實施形態的剖面圖。BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing an embodiment of a light diffusing sheet of the present invention.
圖2係補足本發明之評估方法的參考圖。Fig. 2 is a reference diagram complementing the evaluation method of the present invention.
Claims (4)
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| JP2009285983 | 2009-12-17 | ||
| JP2009285982 | 2009-12-17 |
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| TW201131213A TW201131213A (en) | 2011-09-16 |
| TWI518378B true TWI518378B (en) | 2016-01-21 |
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| TW099144542A TWI518378B (en) | 2009-12-17 | 2010-12-17 | Light diffusing flakes and the use of this backlight |
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| US (1) | US9519085B2 (en) |
| JP (1) | JP5985187B2 (en) |
| KR (1) | KR101696005B1 (en) |
| CN (1) | CN102667539B (en) |
| TW (1) | TWI518378B (en) |
| WO (1) | WO2011074648A1 (en) |
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| GB201016566D0 (en) * | 2010-10-01 | 2010-11-17 | Barco Nv | Curved back projection screen |
| US10288995B2 (en) | 2017-06-15 | 2019-05-14 | Esterline Belgium Bvba | Aspherical dome display and method of rear projection |
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| JP3790571B2 (en) | 1995-11-06 | 2006-06-28 | 株式会社きもと | Light diffusing sheet and backlight unit for liquid crystal display using the same |
| JP4652527B2 (en) * | 2000-05-16 | 2011-03-16 | 株式会社きもと | Light diffusing sheet |
| JP2001324607A (en) | 2000-05-16 | 2001-11-22 | Kimoto & Co Ltd | Light-diffusing sheet |
| JP2004004417A (en) * | 2002-04-18 | 2004-01-08 | Nitto Denko Corp | Light diffusion sheet, optical device and image display device |
| US20030214719A1 (en) * | 2002-05-16 | 2003-11-20 | Eastman Kodak Company | Light diffuser containing perimeter light director |
| US7338699B2 (en) * | 2002-10-31 | 2008-03-04 | Tosoh Corporation | Island projection-modified part, method for producing the same, and apparatus comprising the same |
| WO2005085914A1 (en) * | 2004-03-03 | 2005-09-15 | Kimoto Co., Ltd. | Light control film and backlight device using it |
| CN100442085C (en) * | 2004-03-03 | 2008-12-10 | 木本股份有限公司 | Light control film and backlight device using it |
| JP2006127798A (en) * | 2004-10-26 | 2006-05-18 | Toshiba Matsushita Display Technology Co Ltd | Lighting system and liquid crystal display device |
| JP4571561B2 (en) * | 2005-09-08 | 2010-10-27 | トーカロ株式会社 | Thermal spray coating coated member having excellent plasma erosion resistance and method for producing the same |
| JP5102951B2 (en) * | 2005-10-14 | 2012-12-19 | 株式会社ジロオコーポレートプラン | Light diffusion sheet and backlight unit using the same |
| KR101251702B1 (en) | 2006-01-24 | 2013-04-05 | 키모토 컴파니 리미티드 | Optical film and backlight unit making use of the same |
| WO2008020610A1 (en) * | 2006-08-18 | 2008-02-21 | Dai Nippon Printing Co., Ltd. | Optical laminate, polarizer and image display unit |
| JP5027583B2 (en) * | 2006-08-30 | 2012-09-19 | 日立マクセル株式会社 | Microlens array sheet used for backlight device and roll plate for producing microlens array sheet |
| KR20090047495A (en) * | 2006-08-30 | 2009-05-12 | 히다치 막셀 가부시키가이샤 | Microlens array sheet used for backlight device and roll plate for manufacturing microlens array sheet |
| CN101583824B (en) | 2007-01-24 | 2012-03-21 | 夏普株式会社 | Backlight structure |
| JP2009288732A (en) * | 2008-06-02 | 2009-12-10 | Asahi Kasei Corp | Anti-glare film |
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2010
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- 2010-12-16 KR KR1020127014214A patent/KR101696005B1/en active IP Right Grant
- 2010-12-16 US US13/516,743 patent/US9519085B2/en active Active
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- 2010-12-16 WO PCT/JP2010/072704 patent/WO2011074648A1/en active Application Filing
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| Publication number | Publication date |
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| TW201131213A (en) | 2011-09-16 |
| KR101696005B1 (en) | 2017-01-12 |
| CN102667539A (en) | 2012-09-12 |
| WO2011074648A1 (en) | 2011-06-23 |
| JP5985187B2 (en) | 2016-09-06 |
| US20120257411A1 (en) | 2012-10-11 |
| US9519085B2 (en) | 2016-12-13 |
| CN102667539B (en) | 2014-11-19 |
| KR20120104220A (en) | 2012-09-20 |
| JPWO2011074648A1 (en) | 2013-04-25 |
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